"This ......" Zhang Yu was a little embarrassed, he looked around, and suddenly saw the defense map of Black Castle on the table, and hurriedly said, "Can you introduce the defense of Black Castle?"

"No problem!" Zhao Xiao and Ouyang Mu glanced at each other, and Zhao Xiao said happily.

Zhao Xiao walked to the table, pinched the trick and then slapped it lightly on the table, only to see the complex formation light up, and in the blink of an eye, a three-dimensional miniature black castle appeared in front of everyone.

Zhang Yu sighed with emotion that the miniature black castle was comprehensive, and even the lines on the walls could be seen clearly.

"The castle is divided into three defenses, the first is the defensive array outside the city wall, such as the spiritual path enchantment and the gravity array......" Zhao Xiao said, pointing to the semicircular transparent light film outside the black castle.

"The second is the urn city inside the castle and the flame crossbow on the castle, and the third is the core enchantment of the castle, the Vajra enchantment, and the core energy provided by the spirit stone mine, which can make the Vajra enchantment resist the attack of cultivation below the Dan period, if it is just this underground creature, we can completely resist until the reinforcements arrive......" Zhao Xiao drew the core location, Zhang Yu looked at it and found that the entire inner city was wrapped in it.

Zhang Yu touched his chin and pondered, he looked at the three enchantments carefully, and a strange idea appeared in his mind, maybe he could successfully kill the ghost mother.

"I really have a way, there is a certain chance to kill the ghost mother!" Zhang Yu said after thinking for a long time.

"What's the way?" Zhao Xiao hurriedly asked, if you want to know that if you can kill the ghost mother, it would be the best.

"The Ghost Mother has two goals in attacking Black Castle, one is to kill everyone and eliminate the human forces here......" Zhang Yu's words echoed in the main hall, and everyone nodded in unison.

"The second target is me!" Zhang Yu said bitterly.

Everyone couldn't help but look at each other when they heard this, they didn't know what Zhang Yu meant by this, Ouyang Mu's eyes couldn't help but light up when he heard this.

"If I am used as a decoy, and Fort Black cooperates, I am fifty percent sure that I will lure him out and kill him. Zhang Yu said slowly.

"How do you want us to cooperate?" Zhao Xiao frowned, Zhang Yu's idea was crazy, and he could guess a little.

"Open the Black Fort defense, bring in the ghost mother, and then close the door and beat the dog......" Zhang Yu said with a serious expression and his hands around.

"How can this work?" As soon as Zhang Yu's words came out, several inner disciples jumped up and shouted loudly. Only Zhao Xiao and Ouyang Mu frowned, as if they were thinking about the feasibility of this matter.

Zhang Yu didn't speak, but looked at Zhao Xiao with his arms crossed, and several inner disciples roared for a while, and couldn't help but look at Zhao Xiao.

"This ...... It's too risky, I'll think about it again. Zhao Xiao finally hesitated, it was too risky to open the Black Fort defense, which was equivalent to abandoning his martial arts.

Seeing Zhao Xiao say this, Zhang Yu shrugged his shoulders and didn't speak, and at this moment, he suddenly heard someone outside shouting something, everyone looked at each other, turned around and rushed out.

They appeared on the tower, where they could look down on the entire battlefield, only to see that the Black Castle was surrounded by gray waves, and the enchantment could not close the strong smell of blood, and the gravity formation was getting weaker and weaker.

Zhang Yu, who has super good eyesight, can see some mice crawling in the flesh, and it seems that the gravity formation is already on the verge of collapse.

Maybe the ghost mother also knew about this, and he gave an order, and those relatively large underground creatures, such as cave pythons, quickly swam towards the castle.

"Kill it, kill it!" shouted a few inner disciples, and a few more light bullets flew over, acting as guideposts.

Zhang Yu saw several flaming crossbows on the city wall being stirred, and a thick javelin was installed at the firing position, and he could see that the javelin was carved with runes.

"Aim!" the inner disciple shouted, and several outer disciples operated to aim at the cave python at the front.

"Fire!" As soon as the inner disciple's voice fell, he heard a deafening bowstring vibration in his ears, and several crossbow guns shot out in an instant.

Those few crossbow arrows were said to be late, but it was fast, and the giant python was nailed to the ground by the crossbow before it could react, and at this time, the rune array on the crossbow gun came into play, flickering for a moment and then bursting open.

You must know how strong the scale armor of the cave python is, even if it is an ordinary magic weapon that leaves white spots on it at most, this crossbow gun not only easily shoots through the scale armor, but also blew up the flesh and blood of the cave python, maybe it is too unlucky, a crossbow gun just hit seven inches, and the giant python rolled and twisted in pain for a while, crushing countless mice and other smaller creatures to death before dying in place.

"What a powerful crossbow!" Zhang Yu said with a sigh.

"Of course, this is the most powerful weapon of the sect...... Zhao Xiao said proudly, Zhang Yu nodded, he had heard of the origin of the flame crossbow, which was exchanged by the Dan Dao sect with materials from the instrument dao sect, a defensive weapon, specially designed to deal with remote cultivators, and it was extremely powerful.

Of course, there are a lot of shortcomings, such as troublesome maintenance, and the loading speed is extremely slow, and it is easy to become the first target, but unfortunately the ghost mother does not have too many long-range attack creatures, which can be ignored.

Before everyone was happy for a few minutes, they heard someone shouting loudly, only to see that the rats that were slowly crawling instantly increased their speed, and the gravity circle collapsed.

"Rain of gold!" As someone shouted, countless fireballs rose into the air and exploded in the air outside the castle, turning into patches of fire, and the rats that ran into this range died in an instant, and several huge creatures with thick skin ignored the damage of the fire rain and ran wildly with blood and water.

"Wind Blade!" At this time, several outer disciples stood on the city wall and pinched at those huge creatures, and several translucent shrill wind blades flew out, cutting them in half.

The scene was extremely bloody, and the strong smell of blood made some disciples vomit, but more of them looked at the gray tide with expressionless faces.

The rats seemed to be endless, and the rain of fire was endless, and all the disciples divided into several teams and took turns to release the rain of fire, while the flame crossbow focused on clearing those huge monsters, and the battle was stalemate for a while.

Zhao Xiao gritted his teeth and watched this scene, he knew that although the Black Castle temporarily resisted the attack of the Ghost Mother, there would definitely be problems after a long time.

Zhang Yu also frowned and looked at it, only to see that the underground creatures in the darkness seemed to be endless, this kind of pressure would make people crazy, people with poor psychological quality were easy to collapse, and cultivators were also people.

"Okay, let's all stick to our posts!" Zhao Xiao said and turned to leave, Zhang Yu frowned, turned around and returned to Zhou Fat'er's side, only to see that they were treating the wounded, and the attack just now caused several outer disciples to suffer some minor injuries.

After seeing Zhou Fat'er and others applying medicine to them, Zhang Yu walked in.

When Zhou Fat'er saw Zhang Yu coming in, he couldn't help but give Wang Chensheng a mysterious look, Wang Chensheng nodded and walked out, guarding outside the door.

"What's so mysterious?" Zhang Yu asked curiously.

"Hehe, I found a good baby!" Zhou Fat'er looked at the door, took out a small bottle from his pocket and handed it to Zhang Yu.

Zhang Yu took the bottle and looked at it, and asked curiously, "What is it?"

"I found this thing in the warehouse, as long as there is a drop of the things in it, those creatures will flee when they smell it, if the city is broken, we can use this to escape, isn't it amazing?" Zhou Fat'er said mysteriously.

Hearing this, Zhang Yu couldn't cry or laugh, and he couldn't imagine that Zhou Fat'er's first thought was to run away.

"Are you sure this liquid is useful for every living thing?" asked Zhang Yu.

"This ...... It should be useful!" Zhou Fat'er listened to Zhang Yu's words, hesitated for a moment and said uncertainly.